Al Fathi, Zamahsyari Syayyif, Setyo Hartoto, and Bayu Budi Prakoso. 2022. “The Relationship Between students’ Concentration Level and Smash Result Competency in Badminton Extracurricular”. Sriwijaya Journal of Sport 1 (2): 93-104. https://doi.org/10.55379/sjs.v1i2.359.